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IP.com Disclosure Number: IPCOM000005637D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-23

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Brian Webb Frank Polka


A hermetic boat used for die attach and wire bonding is shown in the accompanying figures. The prior types of boat are illustrated in figure 1. As shown, a plurality of tabs are used to position a ceramic base on the boat. Because of a 1% tolerances allowed in the dimensions of the ceramic base, the distance between the tabs is generally greater than most ceramic bases. This allows for movement of the ceramic package be- tween the tabs, resulting in location problems in die attach and wire bonding. This problem is particularly felt in the handling of large ceramic bases, as large as of 41 With a tolerance of ? l%, there is the possibility of having a 3.96" ceramic base on a boat with tabs spaced 4.04" apart. This leaves a possible variance of 0.08" between the centers of the base and the die.